def create_random(self, n):
""" Create n polygons with random vertices. The dimensions of each
picture should be specified with max_x and may_y.
"""
self.polygons = []
for i in xrange(0, n):
p = Polygon()
# 3 to 5 vertices
Polygon.create_random(p, random.randint(3,5))
self.polygons.append(p)
return self
def mutate(self):
""" Create a new picture by mutating a polygon, adding a polygon,
or removing a polygon.
Return a new picture
"""
new_picture = Picture()
# Buffer changes so we iterate correctly
to_add = []
for polygon in self.polygons:
mutation_type = random.random()
if (mutation_type < 0.1):
# Stay the same
new_polygon = Polygon()
new_polygon.vertices = list(polygon.vertices)
to_add.append(new_polygon)
if (mutation_type < 0.8):
# Do some mutation
to_add.append(polygon.mutate())
elif (mutation_type >= 0.8 and mutation_type < 0.9):
# Add a polygon
new_polygon = Polygon()
new_polygon = new_polygon.create_random(3)
to_add.append(new_polygon)
elif (mutation_type >= 0.9):
# Remove a polygon by not adding it to the new picture
if (len(self.polygons) <= 1):
# Mutate instead if there is only one polygon left
to_add.append(polygon.mutate())
else:
pass
# Add polygons here so that we don't iterate over new polygons
for p in to_add:
new_picture.polygons.append(p)
return new_picture
